Abstract

Both a nonfocusing and a focusing preferential-order volume grating
waveguide coupler were designed, fabricated, and tested. These
volume grating couplers are designed to outcouple a 633-nm wave guided
in an adjacent polyimide waveguide film. The slanted-fringe volume
gratings are recorded holographically by the interference of two 364-nm
waves. The dynamics of the holographic photopolymer HRF600X001 are
investigated in relation to the interaction with the guided
wave. The fabricated couplers exhibited a preferential coupling of
98%, a spatial coupling rate of 3.6 mm-1, and a coupling
efficiency of 95%. The focusing grating coupler focused the
outcoupled beam to a focal line with a full width at half-maximum of
10.49 µm located 25 mm above the grating.

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